Short vibrator



Aug. 2, 1949. c, HUETTEN 2,478,191

SHORT VIBRATOR Filed May 2, 194-4 40 INVENTOR.

62 A REA CE H (/5 T TEN BY WGWM 9 ATTORNEY Patented Aug. 2, 1949 2,478,101 SHOBfi VIBRATOR Clarence Hnettcn, Indianapolis, Ind., asalznor to P. It. Mallory & 00.. Inc., corporation of Delaware Indianapolis, Ind., a

Application May 2, 1944, Serial No. 533,684

The present invention relates to vibrators, and, more particularly, to an electromagnetic vibratory interrupter of novel and improved character.

It is an object of the present invention to provide a vibratory interrupter having substantially smaller dimensions than conventional vibrators.

It is another object of the present invention to provide an electromagnetic vibratory interrupter which departs from conventional design by providing the driver coil around the free end of the vibratory reed rather than above said reed whereby the overall height of the vibrator may be considerably reduced.

It is a further object of the invention to provide a vibratory interrupter of novel and improved character in which a bell-shaped electromagnet is employed having a space in the center thereof into which the free end of the vibratory reed may protrude and may be deflected upon said electromagnet being energized.

It is also within the contemplation of the in vention to provide a vibratory interrupter in which the magnetic circuit is greatly reduced in length by the arrangement of a driver coil around the vibratory end of the reed whereby increased efficiency and reduced dimensions are realized.

The invention also contemplates a vibratory interrupter of reduced dimensions which is very simple in structure, efiicient and foolproof in its operation, and which may be readily manufactured and sold on a practical and commercial scale at a low cost.

4 Claims. (Cl. 200-90) parts will be identified by specific names, for

convenience, but they are intended to be as Other and further objects and advantages of the invention will become apparent from the following description taken in conjunction with the accompanying drawing; in which Fig. 1 illustrates a vertical sectional view, having parts in elevation, of a preferred embodiment of the present invention;

Fig. 2 depicts a similar sectional view, having parts broken away for reasons of clarity, and taken at right angles to the plane of Fig. 1; and

Fig. 3 is a horizontal sectional view taken on line 3-3 of Fig. 1.

While a preferred embodiment of the invention is described herein, it is contemplated that considerable variation may be made in the method of procedure and the construction of parts without departing from the spirit of the invention. In the following description, and in the claims,

generic in their application to similar parts as the art will permit.

Referring now more particularly to the draw ing, reference character I0 designates a cupor bell-shaped member constituted of ferromagnetic material, such as steel. The cup-shaped member is generally formed by drawing and has a hole ll punched in the bottom thereof. Within the cup-shaped member there are provided windings of insulated wirein the form of a cylindrical coil [2 constituting the driver coil of the vibrator. Preferably, this coil is wound separately and after its completion is slipped into the cup-shaped member and is fixed therein by means of tight fit or by means of a suitable cementing material.

One end of the coil is welded or soldered to the edge of opening II at [3, while its other end is extended through a small hole H in the cupshaped member and is electrically connectedto one of the side springs, as it will appear presently. It will be noted that coil l2 has a center space l5 therein, correspondin in diameter to that of opening II. The coil is supported by means of a strip of ferromagnetic material l6 welded to the outer surface of cup In at H. The upper terminal portion of strip I6 is bent horizontally along the top of the cup-shaped member and has its end depending into center space 15, constituting a pole piece l8. The lower terminal portion of the strip is bent downwardly and is clamped at its end I 9 in the stack.

Progressing from the left to the right (Fig. 2), the stack comprises the lower end of ferromagnetic strip l6, insulative spacer 20, side spring 2|, insulative spacers 22 and 23 having reed 24 clamped therebetween, side spring 25, insulative spacer 26, and metal spacer 27. The stack is held together by means of a bolt 28 and nut 29, the bolt extending through aligned holes in the stack parts and insulated from the side springs by means of insulative bushings (not shown) in the conventional manner. Lead wire 30 of coil 12 is electrically connected to one of the side springs, such as side spring 2 I.

The vibratory structure comprises the vibratory reed 24 to which there are secured by means of rivets 3| a pair of side arms 32 hearing vibratory contacts 33. These vibratory contacts are adapted to cooperate during vibration of the reed with relatively fixed contacts 34 carried by side arms 2| and 25. The upper end of reed 24 has an armature or weight 35 constituted of ferromagnetic material attached thereto which extends into close proximity of pole piece l8.

From the foregoing description, the operation of the vibratory interrupter embodying the invention will be readily understood by those skilled in the art. The circuit of the vibrator being organized along conventional lines does not require any detailed description and it will be sufficient to state that when the vibrator is properly connected to a source of current and the primary winding of a transformer, coil l2 will be energized and will deflect reed 24 as a result of the maintained in vibration in a manner well understood.

To protect the vibrator from dust, dirt, and moisture, and to reduce or to eliminate noise and mechanical vibration during the operation thereof, it is preferably enclosed within a metal can 36 lined with sponge rubber as indicated at 31 and closed at its lower end by means of an insulative disc 38. From disc or wafer 38 depend contact prongs 93 which are electrically connected to the vibrator terminals. The number and the arrangement of these prongs is determined by the organization of the vibrator and by the circuit used and some of them ma merely serve to hold the vibrator more securely in its socket but may be electrically disconnected. The stack portion of the vibrator is embedded in a sponge rubber mounting member 40 having a center hole 4| therein gripping the stack and yieldingly holding the same in vibration-absorbing relation. It will be noted that the diameter of the cup-shaped member ID is slightly smaller than the inner diameter of the can liner 3'! so that it permits free movement of the upper end of the vibrator within the can and at the same time assures wider support distribution.

It will be noted that the vibrator of the invention provides a number of important advantages. Thus, first of all, the driver coil being arranged around the free end of the vibratory reed, rather than above the same, the overall height of the vibrator is considerably reduced. Likewise, by distributing the coil around the reed instead of the conventional method of placing it on one side of the reed, the vibrator may have a smaller overall diameter. In other words, the principles of the present invention make it possible to reduce both of the essential dimensions of a vibrator. The magnetic circuit confines the flux principal- 1y to the cup, pole piece, and the reed weight, thereby reducing the effect of variables in the circuit. Moreover, the novel vibrator reduces the vibrator sensitivity to outside pressure due to high weight distribution and it still maintains the desirable qualities of resilient mounting, low mechanical shake, and noise, and protection for the vibratory parts. The principles of the invention are especially adaptable to the construction of high-frequency vibrators.

While the present invention, as to its objects and advantages, has been described herein as carried out in specific embodiments thereof, it

'4 is not desired to be limited thereby but it is intended to cover the invention broadly within the spirit and scope of the appended claims.

What is claimed is:

1. A vibratory electromagnetic interrupter which comprises in combination a cup constituted of ferromagnetic material having a bottom opening therein, a ring-shaped coil within and supported by said cup and defining therein an axial space conforming to said opening, a ferromagnetic strip attached to said cup having its upper end extending into said cup and forming a pole piece therefor and having its lower end extending downwardly, a stack secured to the lower end of said strip, a vibratory reed bearing vibratory contacts having one of its ends clamped in said stack and having its other end extending into the axial space of said coil through the opening in said cup for transverse movement relative to a longitudinal axis or said space, relatively fixed contacts cooperating with said vibratory contacts, and supporting springs for said fixed contacts clamped in said stack.

2. A vibratory electromagr etic interrupter which comprises in combination a stack, a vibratory reed having one of its ends clamped in said stack and carrying an armature at its ree end, vibratory contacts on said reed, statioi 'y contacts cooperating with said vibratory contacts, stack-clamped side springs for supporting said stationary contacts, a driver coil around said ar- V mature, a ferromagnetic shell encircling and supporting said coil having a bottom opening through which said reed and said armature may extend for transverse movement relative to a longitudinal axis of said opening, stack-clamped mounting means for said shell having pole pieceforming extensions adapted to apply deflecting force to said armature when said coil is energized, a casing for said vibrator, vibration-absorbing means for holding said vibrator within said casing, and a lining of elastic material for I said casing having a slightly greater diameter than said ferromagnetic shell.

3. A vibratory electromagnetic interrupter which comprises in combination a ferromagnetic cup open at its top and having an opening of smaller diameter in the bottom thereof, an annular driver coil within and supported by said cup and having an axial recess extending therethrough aligned with the bottom opening of the cup, a vibratory reed having its free end extending freely into said axial recess through said bottom opening of said cup for lateral movement therein, a ferromagnetic strip secured in an intermediate region thereof to said cup and having one of its ends bent into pole piece-forming position for cooperation with the free end of the reed. means for securing the fixed end of the reed to the other end of said strip. and contact means operable by said reed to control a plurality of electric circuits including that or said coil thereby to maintain said reed in vibration.

4. A vibratory electromagnetic interrupter which comprises in combination a stack, a vibratory reed having one of its ends clamped in said stack and carrying an armature at its free end, vibratory contacts on said reed, stationary contacts cooperating with said vibratory contacts, stack-clamped side springs for supporting said stationary contacts, a driver coil around said armature, a ferromagnetic shell open at its top encircling and supporting said coil and having a bottom opening through which said reed and said armature may extend freely into the coil for lat- I 6 eral movement therein, and mounting means for 'said shell; said means comprising a ierromag- REFERENCES netic' strip, one end of said strip being clamped Th following reierenees are of record in the in said stack, thev other-end of said strip being file of this patent:

bent' into hook-shaped pole piece-forming eon- UNIT figuration freely extending through the open top ED STATES PAWS of the shell into the coil for coopei ation with the Number Name Dat said armature, and an intermediate portion of 7 tt July 7, 1903 said strip being secured to said ferromagnetic 916,505 Thullen a 3 1909 hell, 1 2,190,685 Slater Feb. 20, 1940 L E E HUEYITEN, 2,423,524 Side July 8, 1947 

